Composite blast furnace tuyere



March 7, 1950 E. M. NEELY 2,500,039

COMPOSITE BLAST FURNACE TUYERE Filed March 6, 194"! 2 Sheets-Sheet 1Big. 2 INVENTOR.

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Patented Mar. 7, 1950 UNITED STATES PATENT OFFICE comro'srrr: BLASTFURNACE TUYEBE Eugene M. Neely, Pittsburgh, Pa., assignor to William M.Bailey Company, Pittsburgh, Pa... a corporation of PennsylvaniaApplication March 6, 194?, Serial No. 732,738

This invention relates to blast furnace tuyeres and more particularly/to a composite tuyere structure consisting of double copper walls formaintaining a circulating flow of cooling medium in the body of thetuyere and a graphite nose or end to protect the tuyre from burningthrough to the circulating chamber.

The invention will become more apparent from a consideration of theaccompanying drawings, constituting a part hereof, in which likereference characters designate like parts, and in which Fig. l is avertical cross sectional view, partially in elevation, of a compositeblast furnace tuyere em dying the principles of this invention;

Fig. 2 an exploded view in vertical section showing the copper tuyerebody and the graphite nose;

Fig. 3 a vertical cross sectional view of a modifled form of compositetuyere structure;

.Fig. 4 a cross sectional view taken along the line 4-4, Fig. 3; and

Fig. 5 a cross sectional view through the nose of the tuyre taken alongthe line 5-5, Fig. 3.

In the drawings the numeral I designates the furnace brickwork having anopening in which is placed the tuyere cooler 2 which is provided with aconstricted end 3 which receives the tapered body 4 of a copper tuyere,generally designated by the reference numeral 5. The tuyre is providedwith a circulating chamber 6 communicating by threaded openings 1 and 8with a water cooling system. A blow pipe 9 is disposed in the tuyereopening and is adapted to seat on 'the chamfered inner wall III of thetuyere. As shown in the exploded view in Fig. 2, the tuyere body isprovided with a threaded portion ii for receiving the threads I: of agraphite sleeve it which, when placed on the tuyere as shown in Fig. 1,provides a protecting nose for the tuycre body. Thus, even if thegraphite sleeve II contacts the stock in the furnace its meltingtemperature is very much greater than that of any part of the furnace sothat the graphite nose tTall not burn away and expose the copper mem- Inthe form of the device shown in Fig. 3, the same composite constructionof copper tuyre and graphite nose is employed, but the threaded portionII is brought back against the shoulder II that is in substantialalignment with the brick of the furnace wall I. The graphite sleeve ilprotects the entire tuyere nose andis supportedonthetuyerebothatthethreadedend "and on the constricted portion'il thatseats on the 55 1,888,806

sleevebcaringllattbeeudofthcnose.

2 Claims. (01. 266-41) The graphite sleeve is practically always in aninert atmosphere since the oxygen-laden air from the air nozzle 9 passesthrough the tuyere opening and is projected into the furnace interior.The oxygen therefore does not combine with the carbon of the graphitesleeve to support combustion.

The twere body itself retains the proved characteristics of moderncopper tuyeres in that it has a water cooled body portion and is fittedinto the tuyere cooler and connected to the cooling circulating systemin the same manner as other standard types of tuyres while it isprotected against burn-outs by the graphite sleeve or nose.

Although several embodiments of the invention have been illustrated anddescribed, it will be evident to those skilled in the art that variousmodifications may be made in the details of construction withoutdeparting from the principles herein set forth.

I claim:

1. A composite tuyere structure for blast furnaces and the likecomprising a hollow metal sleeve of substantially frusto-conical shapehaving a shoulder adjacent the furnace wall and having a graphite nosemounted thereon extending substantially the full length of the tuyrebody that is exposed to the furnace interior, said tuyere body andgraphite nose having threaded body portions adjacent said shoulderinteracting to securely mount the same, said graphite per tion having anend wall of substantial thickness for enveloping the metallic nose.

2. A tuyre for blast furnaces comprising a hollow metallic member havinga shoulder sub- 7 stantially flush with the furnace wall and having athreaded portion adjacent said shoulder, a graphite nose extending thefull length of the tuyere from the shoulder to the nose having athreaded end for interacting with the thread of the tuyere mounted onsaid tuyre and having a heavy wall portion enveloping the outer wall andnose of the tuyere, said tuyere being hollow for circulating a coolingmedium therein.

EUGENE M. NEELY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED sums PATENTS Number Name Date 1,441,178 Schiegries et al. Jan. 2,1923 1,662,850 Ebner Mar. 20, 1928 Boland July 19. 1932 2,002,280 lib:et ll. June 1, 193'!

